Need help with Nero/Utopia compatability?

I recently purchased a Dreamcast and am new at this...I am attempting to burn a Utopia boot CD with Nero,so first I downloaded Nero burning rom V5.0 demo,then the Utopia boot CD file in Nero format.next I did exactly as the instructions say,selected Image burn from the Nero menu,selected the Utopia .nrg image file and chose x2 speed (for quality) but for some reason the CD will never burn.anyone have any suggestions? I am using a Mitsumi CR-4802TE CD burner.